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[1]Yao Hongbin,Wen Zhongming,Zhang Tianyou,et al.Spatiotemporal Pattern of GPP of Grassland Ecosystem in Northern China Based on CMIP6[J].Research of Soil and Water Conservation,2024,31(04):266-274.[doi:10.13869/j.cnki.rswc.2024.04.017]

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Spatiotemporal Pattern of GPP of Grassland Ecosystem in Northern China Based on CMIP6

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 04 Page number: 266-274 Column: Public date: 2024-06-30

Title:: Spatiotemporal Pattern of GPP of Grassland Ecosystem in Northern China Based on CMIP6

Author(s):: Yao Hongbin¹, Wen Zhongming^1,2, Zhang Tianyou¹, Yuan Liuhuan¹, Lin Ziqi¹, Zheng Cheng¹; (1.College of Grassland Agriculture, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.Research Center of Soil and Water Conservation and Ecological Environment, CAS & MWR, Yangling, Shaanxi 712100, China)

Keywords:: annual gross primary productivity(AGPP); CMIP6; grasslands of northern China; spatiotemporal variation

CLC:: Q948.112

DOI:: 10.13869/j.cnki.rswc.2024.04.017

Abstract:: [Objective]The aims of this study are to reveal the spatiotemporal variation of the annual gross primary productivity(AGPP)of grassland in northern China, and to provide an important basis for the policy formulation of grassland restoration and protection. [Methods]Based on the GPP simulation data of nine Earth system models in CMIP6, the traditional multi-model ensemble average(MME)was used to estimate the temporal and spatial changes of AGPP in grassland ecosystem of northern China in the 21st century under four future scenarios(SSP1-2.6, SSP2-4.5, SSP3-7.0 and SSP5-8.5). [Results](1)The accuracy and yearly trends of the MME simulation are more accurate than other individual patterns.(2)From 1982 to 2100, the AGPP in grasslands in northern China showed a fluctuating upward trend, and the upward trend under the high greenhouse gas emission scenario was greater than the upward trend under the low greenhouse gas emission scenario.(3)Spatially, the average AGPP of grassland in northern China showed an increasing trend from northwest to southeast under both historical and future scenarios, with the lowest annual average AGPP at 308.03 g C/(m²·a)under SSP1-2.6 scenario and the highest at 389.63 g C/(m²·a)under SSP5-8.5 scenario.(4)Among different grassland types in the four future scenarios, the annual mean value of AGPP in temperate grassland will be the highest 〔445.44 g C/(m²·a)in SSP1-2.6 scenario and 474.53 g C/(m²·a)in SSP2-4.5 scenario〕. Under SSP3-7.0, it will be 532.42 g C/(m²·a), under SSP5-8.5, it will be 558.14 g C/(m²·a), and sparse shrub will be the lowest 〔128.51 g C/(m²·a)under SSP1-2.6〕. It will be 141.31 g C/(m²·a)under SSP2-4.5, 155.38 g C/(m²·a)under SSP3-7.0, and 167.29 g C/(m²·a)under SSP5-8.5. [Conclusion]The AGPP in grassland in northern China will show a significant growth trend in the future, and the change trend will increase with the increase of radiation intensity and CO₂ emissions. The growth trend of AGPP under different scenarios is different, and the higher the emission scenario, the more significant the growth. Future research on AGPP change of grassland in northern China should be strengthened.

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Last Update: 2024-06-30